Hi can I update my phone ti iOS 15? I

If your iPhone is eligible for an update, check Settings -> General -> Software Update.

You can check by reading this Apple article: iPhone models compatible with iOS 15

https://support.apple.com/en-gb/guide/iphone/iphe3fa5df43/ios

If your iPhone is eligible for an update, check Settings -> General -> Software Update.

You can check by reading this Apple article: iPhone models compatible with iOS 15